AEMC 4500 - Recharging Built-In Battery; Power Supply From External Battery; Replacing Battery

Digital Ground Resistance Tester Model 4500 39
5.2.3 Recharging Built-In Battery
• Usethepowercordstoredinsidethecompartmentwithinthecover.
• Plugthepowercordintothefemaleinputjack.
• Connecttheotherendofthecordtoapoweroutlet(voltagemustbe
thesameasvoltageindicatedontheplateidentiedas“11”).
• Theredlightwillturnonandremainlitwhilethebatteryisrecharging.
Charging time is 14hrs. minimum for a discharged battery.
NOTE 1: The battery may be charged for more than 14 hours without
damagingtheinstrument(internalprotection).
NOTE 2: Do not allow the battery to remain discharged for more than
several days.
NOTE 3: If an instrument is not used frequently, the battery should be
recharged regularly, three-month intervals are recommended.
5.2.4 Power Supply from External Battery
The external battery should be directly connected to the appropriate
terminals.Besuretoobservetheproperpolarities.Theexternalbattery
does not charge the internal battery.
NOTE: It is not necessary to remove the battery supplied with the instru-
mentwhenusinganexternalbatteryorsupply.
5.2.5 Replacing Battery
• Usethehexkeytounscrewthesixfasteningscrewsfromthechas-
sis, which are located on the bottom of the case.
• Pulloutthechassis
(Figure22).Remember
to unplug the ribbon
cable which connects
the power supply board
in the bottom of the case
to the boards mounted
in the chassis.
• Removethewingnuts,
the spacers, and the
protective cover to gain
accesstothetwo12V
DC battery (See Figure
23).
Chassis
Ribbon Cable
Case
Fastening Screws
X
X
Z
Y
v
BATTERY
CHARGE
BLINKIN
G DISPLAY
AND
POINTER INDICATE
EXCESSIVE
- TRANSIENT NOISE
- ELECTRODE
RESISTANCE
EXTERNAL
12 V
TEST
RANGE
TEST CURRENT
DIGITAL GROUND
RESISTANCE
TESTE
R
MODEL 4500
mA
2
10
50
Ω
kΩ
2
20
200
2
20
50/60/400
Hz_110V
!
BEEPER
INDICATES HIGH
GROUND VOLTAGE
AEMC
I N S T R U M E N T S
Figure 22